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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.drill.exec.compile;
import java.io.IOException;
import java.net.URL;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import org.apache.drill.exec.exception.ClassTransformationException;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.io.Resources;
class ByteCodeLoader {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(ByteCodeLoader.class);
private final LoadingCache<String, byte[]> byteCode = CacheBuilder.newBuilder().maximumSize(10000)
.expireAfterWrite(10, TimeUnit.MINUTES).build(new ClassBytesCacheLoader());
private class ClassBytesCacheLoader extends CacheLoader<String, byte[]> {
public byte[] load(String path) throws ClassTransformationException, IOException {
URL u = this.getClass().getResource(path);
if (u == null)
throw new ClassTransformationException(String.format("Unable to find TemplateClass at path %s", path));
return Resources.toByteArray(u);
}
};
public byte[] getClassByteCodeFromPath(String path) throws ClassTransformationException, IOException {
try {
return byteCode.get(path);
} catch (ExecutionException e) {
Throwable c = e.getCause();
if (c instanceof ClassTransformationException)
throw (ClassTransformationException) c;
if (c instanceof IOException)
throw (IOException) c;
throw new ClassTransformationException(c);
}
}
}
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